Numerical Investigation of the Influence of a Magnetic Field on the Laminar Flow of a Yield-Stress Nanofluid over a Backward Facing Step  

作　　者：Karim Amrani Eugenia Rossi di Schio Mohamed Bouzit Abderrahim Mokhefi Abdelkader Aris Cherif Belhout Paolo Valdiserri 

机构地区：[1]Mechanical Manufacturing Technology Research Laboratory(LaRTFM),National Polytechnic School of Oran Maurice Audin,El mnaouar,Bp 1523,Es-senia,Oran,31000,Algeria [2]Department of Industrial Engineering DIN,Alma Mater Studiorum-University of Bologna,Viale Risorgimento 2,Bologna,40136,Italy [3]Laboratory of Maritime Sciences and Engineering,LSIM Faculty of Mechanical Engineering,University of Science and Technology of Oran,Mohamed Boudiaf,El Mnaouer,Oran,31000,Algeria [4]Mechanics,Modeling and Experimentation Laboratory L2ME,Faculty of Sciences and Technology,Bechar University,Bechar,08000,Algeria

出　　处：《Frontiers in Heat and Mass Transfer》2025年第1期185-206,共22页热量和质量传递前沿(英文)

摘　　要：The present study focuses on the flow of a yield-stress(Bingham)nanofluid,consisting of suspended Fe3O4 nanoparticles,subjected to a magnetic field in a backward-facing step duct(BFS)configuration.The duct is equipped with a cylindrical obstacle,where the lower wall is kept at a constant temperature.The yield-stress nanofluid enters this duct at a cold temperature with fully developed velocity.The aim of the present investigation is to explore the influence of flow velocity(Re=10 to 200),nanoparticle concentration(ϕ=0 to 0.1),magnetic field intensity(Ha=0 to 100),and its inclination angle(γ=0 to 90)and nanofluid yield stress(Bn=0 to 20)on the thermal and hydrodynamic efficiency inside the backward-facing step.The numerical results have been obtained by resolving the momentum and energy balance equations using the Galerkin finite element method.The obtained results have indicated that an increase in Reynolds number and nanoparticle volume fraction enhances heat transfer.In contrast,a significant reduction is observed with an increase in Hartmann and Bingham numbers,resulting in quasi-immobilization of the fluid under the magnetic influence and radical solidification of this type of fluid,accompanied by the suppression of the vortex zone downstream of the cylindrical obstacle.This study sheds light on the complexity of this magnetically influenced fluid,with potential implications in various engineering and materials science fields.

关 键 词：Yield-stress nanofluid Bingham nanofluid backward-facing step BFS magnetic field heat transfer HYDRODYNAMICS 

分 类 号：O35[理学—流体力学]